feat: add S3-compatible storage provider (MinIO, Ceph, R2, etc.)

Adds a new 'S3-Compatible Storage' provider that works with any
S3-API-compatible object storage service, including MinIO, Ceph,
Cloudflare R2, Backblaze B2, and others.

Changes:
- New provider class: classes/providers/storage/s3-compatible-provider.php
  - Provider key: s3compatible
  - Reads user-configured endpoint URL from settings
  - Uses path-style URL access (required by most S3-compatible services)
  - Supports credentials via AS3CF_S3COMPAT_ACCESS_KEY_ID /
    AS3CF_S3COMPAT_SECRET_ACCESS_KEY wp-config.php constants
  - Disables AWS-specific features (Block Public Access, Object Ownership)
- New provider SVG icons (s3compatible.svg, -link.svg, -round.svg)
- Registered provider in main plugin class with endpoint setting support
- Updated StorageProviderSubPage to show endpoint URL input for S3-compatible
- Built pro settings bundle with rollup (Svelte 4.2.19)
- Added package.json and updated rollup.config.mjs for pro-only builds

vendor/Aws3/GuzzleHttp/Cookie/SessionCookieJar.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Cookie;
+
+/**
+ * Persists cookies in the client session
+ */
+class SessionCookieJar extends CookieJar
+{
+    /**
+     * @var string session key
+     */
+    private $sessionKey;
+    /**
+     * @var bool Control whether to persist session cookies or not.
+     */
+    private $storeSessionCookies;
+    /**
+     * Create a new SessionCookieJar object
+     *
+     * @param string $sessionKey          Session key name to store the cookie
+     *                                    data in session
+     * @param bool   $storeSessionCookies Set to true to store session cookies
+     *                                    in the cookie jar.
+     */
+    public function __construct(string $sessionKey, bool $storeSessionCookies = \false)
+    {
+        parent::__construct();
+        $this->sessionKey = $sessionKey;
+        $this->storeSessionCookies = $storeSessionCookies;
+        $this->load();
+    }
+    /**
+     * Saves cookies to session when shutting down
+     */
+    public function __destruct()
+    {
+        $this->save();
+    }
+    /**
+     * Save cookies to the client session
+     */
+    public function save() : void
+    {
+        $json = [];
+        /** @var SetCookie $cookie */
+        foreach ($this as $cookie) {
+            if (CookieJar::shouldPersist($cookie, $this->storeSessionCookies)) {
+                $json[] = $cookie->toArray();
+            }
+        }
+        $_SESSION[$this->sessionKey] = \json_encode($json);
+    }
+    /**
+     * Load the contents of the client session into the data array
+     */
+    protected function load() : void
+    {
+        if (!isset($_SESSION[$this->sessionKey])) {
+            return;
+        }
+        $data = \json_decode($_SESSION[$this->sessionKey], \true);
+        if (\is_array($data)) {
+            foreach ($data as $cookie) {
+                $this->setCookie(new SetCookie($cookie));
+            }
+        } elseif (\strlen($data)) {
+            throw new \RuntimeException('Invalid cookie data');
+        }
+    }
+}